Heavy Duty Metal Separating Zippers
Extra sturdy metal zips. 1.25 inches wide. Two lengths available, grab one and make a sleeping bag or a tent. These guys are pretty tough. Put them to work!
Shipping charges are minimal once you buy your first item, so it's just good budgeting to buy at least two items while you're here. Zips in particular are much more worthwhile when purchased in multiples.